GBC has budgeted sales in units for the next five months as follows: June 4,500 units July 7,100 units August 5,300 units September 6,700 units October 3,700 units Past experience has shown that the ending inventory for each month must be equal to 10% of the next month's sales in units. The inventory on May 31 contained 410 units. The company needs to prepare a production budget for the second quarter of the year. A.. What is the opening inventory in units for September? B. What is the total number of units to be produced in July? C. What is the desired ending inventory for August?